Three-month-old babies did not poop for two days, can be seen in normal physiological phenomena, pathological conditions, the intervention needs to be based on the cause of the decision, such as constipation of babies need to use micro-ecological agents or open-cephalos and other interventions, as appropriate. 1. Normal physiological phenomenon: for some formula-fed babies, daily or every other day defecation habits, the above phenomenon, and the baby does not have defecation difficulties and abdominal discomfort and other manifestations, this kind of baby is a normal physiological phenomenon, there is no need to intervene, and close observation. 2. Pathological conditions: such as functional constipation, the baby did not relieve stool for two days, abdominal discomfort and other manifestations, the treatment should be appropriate to use Keserol to soften the stool, so that the stool is easy to discharge, need to pay attention to the use of the process of gentle movements, while the application of micro-ecological preparations as prescribed by the doctor, such as clostridium typhimurium bacteria loose to regulate the intestinal flora and other therapies. The above medications should be used under the guidance of a physician, and it is recommended to consult a physician when necessary, and have the intervention guided by a specialist after evaluation.